Talking with chat I found out that kitty may modify some glyphs and make them look the same as others. My tmux config had these ”◤◥” but they looked more stretched and that made my tmux status bar look nice on kitty but horrible on any other terminal. I also have a list from chat

SymbolUnicodeTypical UseDescription
U+E0B0Right separatorTriangle pointing right
U+E0B1Right thin separatorThin right angle separator
U+E0B2Left separatorTriangle pointing left
U+E0B3Left thin separatorThin left angle separator
U+E0B4Right roundedCurved right separator
U+E0B5Right thin roundedCurved thin right separator
U+E0B6Left roundedCurved left separator
U+E0B7Left thin roundedCurved thin left separator
U+E0B8Right bold triangleWide triangle
U+E0BALeft bold triangleInverse of , points left
U+E0BBLeft thin triangleNarrow version of
U+E0B9Right thin triangleNarrow version of
U+E0BEInverse of , points down
U+E0BCInverse of , points down

Sources